A conspirator within the Shirane Group who allies with Mizushima to overthrow their leader. He hires an outside attacker and later participates in a treacherous plan to have Shirane Kozo killed. Captured and coerced by Kunihiko, his taped confession becomes a pivotal tool for blackmail before he is exchanged for cash.
Kunihiko captures Muroi to extract a damning confession, using him as leverage against the syndicate.
Muroi financially backs Numata's services to eliminate key rivals and advance the conspiracy.
Tsuchiya and Muroi collaborate to overthrow leadership and secure a power pact under Kaito.
Muroi's involvement with Yokomizo forces backfires, resulting in his kidnapping and exchange.
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